AA 1476 then WN 855 at Seattle
Chicago O'Hare → Seattle → Oakland
Timetable, Seattle time
14:17AA 1476 from Chicago O'Hare at the gate
20:40WN 855 to Oakland leaves the gate
6 h 23 apart on the timetable
Seattle’s board gives a departure time for only about 56% of its flights, so many days show no gate time.
The last days
AA 1476 and WN 855 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.
Later flights to Oakland
No later flight to Oakland on the timetable.